Castrol SLX 0w30 SL/A3, Toyota 2.4L 2AZ-FE, 4893km

[Ken4]

This is my fourth UOA on my 2002 Toyota Ipsum done by Dyson Analysis. Latest results on the right, oldest on the left. The spike in lead is most probably due to my IAC valve cleaning using a TB cleaner just before dumping out this oil. I suspect the TB cleaner also caused the oil to thicken. Im very happy with the fuel economy of this vehicle, it's getting its best ever fuel economy since I switched from Shell V-Power 98 to Caltex Vortex Platinum 98.

Oil
Toyota OEM, Castrol RS 10w50, Castrol RS 10w50, Castrol SLX 0w30

Mileage on car
1072km, 6056km, 11080km, 15973km

Mileage on oil
1072km, 4984km, 5024km, 4893km

Time on oil
1month, 7months, 6.5months, 5months

Make-up oil
none, none, none, none

IR
Soot (St)
44, 0, 0, 0
Oxidation (Oxi)
22, 63, 76, 117
Nitration (Nit)
30, 77, 105, 4
Sulfation (Sul)
18, 40, 75, 86

Metal
Iron (Fe)
6, 11, 11, 11
Copper (Cu)
47, 16, 4, 2
Chromium (Cr)
0, 0, 0, 0
Aluminum (Al)
7, 3, 2, 2
Lead (Pb)
1, 7, 3, 9
Tin (Sn)
1, 5, 1, 0
Silicon (Si)
200, 69, 32, 26
Sodium (Na)
3, 5, 1, 1
Potassium (K)
0, 1, 0, 0
Molybdenum (Mo)
435, 84, 12, 3
Phosphorus (P)
693, 751, 741, 775
Zinc (Zn)
861, 895, 850, 830
Calcium (Ca)
1540, 2568, 2463, 3075
Magnesium (Mg)
16, 117, 174, 124

Physical
Water (W)
N, N, N, N
Fuel (F)
N, N, N, N
Antifreeze (A)
N, N, N, N
Total Base Number (Tbn)
6, 6, 7, 9
Viscosity At 100 C (V100)
9.4, 18.5, 17.9, 13.1

 

[zoomzoom]

you have only 15973km on your car and you already cleaned TB? Why?
I have 2000 mazda 626 V6,the other day I was checking my air filter and I took a peek in my TB after 84K miles it is still very clean!

 

[friendly_jacek]

Fe and Pb highish for such short intervals...
Going from 10W50 to 0W30, are you trying to prove something?
Nice example how Toyota engines leach Cu and Si when new.

 

[Al]

Well..It looks like it might need oil a tad thicker but the 30 wt is already a 40 wt. Probably bc some 50 wt was left over.

 

[Ken4]

quote:

---

Originally posted by zoomzoom:
you have only 15973km on your car and you already cleaned TB? Why?

---

The 2AZ-FE has a problem has a known problem with an unstable idle in 'D' with AC on. Every 10~20secs, the idle speed will intermittently drop below 600rpm. A few squirts of TB cleaner into the IAC valve seems to have fixed the problem.

 

[Ken4]

quote:

---

Originally posted by friendly_jacek:
Fe and Pb highish for such short intervals...
Going from 10W50 to 0W30, are you trying to prove something?
Nice example how Toyota engines leach Cu and Si when new.

---

The mileage may be short, but the time duration is not. This vehicle does multiple short trips of less than 2km. About 80% city, 20% highway. Pb is high bcos of TB cleaner. I plan to eventually feed this machine with Fuchs 0w20, and I'm quite confident now thinner oils work well even in hot climates.

 

[Ian]

Thats a good one!!

What do you reckon is the reason for the silicon levels?

Guess my choice of oil after the next oil change, would be the SLX A3 on my Ipsum too....

 

[Ken4]

Gaskets still leeching silicone, may take another ~2 oil changes before it's down to single digit. Fortunately, it's not abrasive dirt.